package com.itheima.interceptor;

import com.itheima.domain.User;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class PrivilegeInterceptor implements HandlerInterceptor {

    /*目标方法执行之前*/
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle...");
        HttpSession session = request.getSession();
        User user = (User) session.getAttribute("user");
        if(user==null){
            response.sendRedirect(request.getContextPath()+"/login.jsp");
            return false;
        }
        return true;
    }
    /*目标方法执行之后，视图返回之前*/
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
        modelAndView.addObject("name", "com/itheima");
    }
    /*在流程执行完毕之后*/
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion...");
    }
}
